However, sometimes, more specific types are available that can provide additional operators, associated functions, or built-in constraint-like validation. Still, data types are often the first line of defense against invalid data.įor many cases, the general types provided by PostgreSQL are appropriate for the kinds of data you'll be storing. Other database tools, like constraints also have a role to play in defining correctness. PostgreSQL can then automatically check proposed values to ensure they match the provided criteria.Īs you get started with types, it's important to remember that types alone are not always a complete solution to data validation, but a component. This allows administrators to precisely define the types of data they expect each column to accept when using CREATE TABLE among other commands. It also allows you to define your own complex types by combining types of different kinds and specifying their parameters. PostgreSQL comes with a large number of types built-in to the software itself. Getting started with PostgreSQL data types We'll cover the most common of these in more depth throughout this guide. PostgreSQL supports a wide range of data types suitable for various types of simple and complex data. What are the data types in PostgreSQL?īefore going into detail, let's take a broad view of what data types PostgreSQL provides. In this guide, we will discuss the most common data types available in PostgreSQL, the different input and output formats they use, and how to configure various fields to meet your applications' needs. PostgreSQL includes a wide range of data types that are used to label and validate that values conform to appropriate types. While it is possible to define custom requirements, data types provide the basic building blocks that allow PostgreSQL to validate input and work with the data using appropriate operations. Values must adhere to the requirements that they outline in order to be accepted by PostgreSQL. This is done by prescribing the columns that these structures contain along with their data type and any constraints.ĭata types specify a general pattern for the data they accept and store. One of the primary features of relational databases in general is the ability to define schemas or table structures that exactly specify the format of the data they will contain.
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